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  Topic Review (Newest First)
09-02-2019 11:06 AM
davepatterson
Did the suspension/shock upgrade work

Joshua,

I have a 2015 CTX for about a year now. I downsized from a Honda ST1300 to get a lighter bike that also lets me have both feet on the ground. There is a lot to like to the CTX, but I dissatisfied with the suspension. Far less control on bumpy roads. What do you think about the upgrade you did? How has it changed ride quailty?
09-02-2019 09:33 AM
maurimy Btw, I made more precise adjustments to see whether the spring fits correctly. My free sag is now 10 mm and the rider sag 40 mm (27%).
08-31-2019 10:37 AM
maurimy My suspension project is now ready. I installed three components: rear shock absorbter, lowering links and adjustable front caps. The shock is a basic model from Ohlins with 56 mm stroke and 312 mm eye-to-eye length. I don't remember exact values of the OEM model, just recall 40 mm and 296 mm. If those values were right, the new one gives 16 mm more stroke and has 16 mm more length. So the change would be approximately 2.68 * 16 = 42.88 mm more rear wheel movement in downward direction. I decided to install new links (in photo) rising the rear wheel 20 mm and lowering the bike body by same number, as a result decreasing the rear wheel downward movement to 2.68 * 16 - 20 mm = 22.88 mm and increasing correspondingly the upward movement 20 mm . After that I adjusted the rider sag to 40 mm, resulting to a bike body position change 22.88 - 40 = -17.12 mm, corresponding the sag of the OEM shock. Then I decreased the front sag conservatively from 56 mm to 45 mm. The riding experience tells that the new rear shock is much more gentle for instance on speed bumps. On the road the bike gives a very stable feeling, maybe I can even decrease rebound. The problem with the OEM shock was that all the gentle part of the spring was already lost under the rider weight and you had only the harsh part left, the result of course depends on the rider weight.

Some words about the spring. It is only 140 N/mm. Using this number we get the load 140 * 56 = 7840 N to reach full stroke. If we use a shock with 40 mm stroke we need a spring 7840/40=196 N/mm. Hopefully my calculations are right.
08-14-2019 04:14 PM
maurimy Michelin tyres have always been a good choice, have never disappointed me.
08-14-2019 03:08 PM
Diama my bike has risen about 10mm more how it was before with maximum preload ! Now it is very inclined on the side stand and it's ready to make long journey with so much weight without any problema! I also put the new michelin road 5 tires!
08-14-2019 02:15 PM
maurimy
Quote:
Originally Posted by Diama View Post
Hi Maurimy! hardest spring, 210! adjustable in compression, extension and wheelbase, hydraulic spring preload which I highly recommend! comfort and stability changes from night to day! seems to drive another bike! my back never tires! if you sent the wilbers behind and received the money, think about this!
Sounds like you have all pieces to enjoy of your ride in future. I hope I also could have hydraulic preload adjustment. I bought Ohlins after returning Wilbers, look at my post here. I had a bit different ideology behind (probably), because I seldom carry with me much luggages, so I preferred stroke and higher seat height instead of carrying capacity. I don't understand how it is possible that Honda failed to design reasonable suspension ending up to something like this OEM suspension. Probably after making too many compromises. I hated the way it took bumps. Your shock absorber was one of those I had in my mind, two Italian, one German and one Swedish shocks. I didn't find US shocks on European markets.
08-14-2019 01:17 PM
Diama Hi Maurimy! hardest spring, 210! adjustable in compression, extension and wheelbase, hydraulic spring preload which I highly recommend! comfort and stability changes from night to day! seems to drive another bike! my back never tires! if you sent the wilbers behind and received the money, think about this!
08-14-2019 06:28 AM
maurimy Diama, looks great. How does this shock differ from the original? Driving experiences, please.
08-14-2019 06:26 AM
maurimy
Quote:
Originally Posted by bmw111 View Post
Can any of you who have installed these aftermarket shock units on your bike let us know how you feel about the ride/handling now? Thank you.
The most obvious difference was that the rubber suspension effect of the OEM shock disappeared. Earlier I raised my buttocks on every bigger bumps. Ohlins with linear coil and more stroke feels more civilized.
.
08-13-2019 06:02 PM
Diama Hello! here is my new shock absorber! and really fantastic!
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